edu.udo.cs.yale.operator.features.transformation
Class PCA

java.lang.Object
  edu.udo.cs.yale.operator.Operator
      edu.udo.cs.yale.operator.features.transformation.PCA

All Implemented Interfaces:

ConfigurationListener

public class PCA
extends Operator

This operator performs a principal components analysis (PCA) using the covariance matrix. The user can specify the amount of variance to cover in the original data when retaining the best number of principal components. The user can also specify manually the number of principal components. The operator outputs a PCAModel. With the ModelApplier you can transform the features.

Version:

$Id: PCA.java,v 1.7 2006/10/01 12:09:24 ingomierswa Exp $

Author:

Daniel Hakenjos

See Also:

PCAModel

Field Summary

private double[][]	covarianz
private Jama.Matrix	covMatrix
private double[][]	data
private double[]	eigenvalues
private Jama.Matrix	eigenvectorMatrix
private double[][]	eigenvectors
private double[]	mean

Constructor Summary

PCA(OperatorDescription description)

Method Summary

IOObject[]	apply() Implement this method in subclasses.
private double	getCovarianz(int dim1, int dim2)
java.lang.Class[]	getInputClasses() Returns the classes that are needed as input.
java.lang.Class[]	getOutputClasses() Returns the classes that are guaranteed to be returned by apply() as additional output.
java.util.List<ParameterType>	getParameterTypes() Returns a list of ParameterTypes describing the parameters of this operator.

Methods inherited from class edu.udo.cs.yale.operator.Operator

addError, addValue, addWarning, apply, checkDeprecations, checkIO, checkProperties, clearErrorList, cloneOperator, createExperimentTree, createExperimentTree, createFromXML, createMarkedExperimentTree, delete, experimentFinished, experimentStarts, getAddOnlyAdditionalOutput, getApplyCount, getDeliveredOutputClasses, getDeprecationInfo, getDesiredInputClasses, getErrorList, getExperiment, getInnerOperatorsXML, getInput, getInput, getInput, getInputDescription, getIOContainerForInApplyLoopBreakpoint, getName, getNumberOfSteps, getOperatorClassName, getOperatorDescription, getParameter, getParameterAsBoolean, getParameterAsColor, getParameterAsDouble, getParameterAsFile, getParameterAsInt, getParameterAsString, getParameterList, getParameters, getParameterType, getParent, getStartTime, getStatus, getUserDescription, getValue, getValues, getXML, hasBreakpoint, hasBreakpoint, hasInput, inApplyLoop, isEnabled, isParameterSet, logMessage, performAdditionalChecks, register, remove, rename, resume, setBreakpoint, setEnabled, setExperiment, setInput, setListParameter, setOperatorParameters, setParameter, setParameters, setParent, setUserDescription, toString, writeXML

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

data

private double[][] data

mean

private double[] mean

covMatrix

private Jama.Matrix covMatrix

covarianz

private double[][] covarianz

eigenvalues

private double[] eigenvalues

eigenvectorMatrix

private Jama.Matrix eigenvectorMatrix

eigenvectors

private double[][] eigenvectors

Constructor Detail

PCA

public PCA(OperatorDescription description)

Method Detail

apply

public IOObject[] apply()
                 throws OperatorException

Description copied from class: Operator

Implement this method in subclasses.

Specified by:

apply in class Operator

Throws:

OperatorException

getInputClasses

public java.lang.Class[] getInputClasses()

Description copied from class: Operator

Returns the classes that are needed as input. May be null or an empty (no desired input). As default, all delivered input objects are consumed and must be also delivered as output in both Operator.getOutputClasses() and Operator.apply() if this is necessary. This default behavior can be changed by overriding Operator.getInputDescription(Class). Subclasses which implement this method should not make use of parameters since this method is invoked by getParameterTypes(). Therefore, parameters are not fully available at this point of time and this might lead to exceptions. Please use InputDescriptions instead.

Specified by:

getInputClasses in class Operator

getOutputClasses

public java.lang.Class[] getOutputClasses()

Description copied from class: Operator

Returns the classes that are guaranteed to be returned by apply() as additional output. Please note that input object which should not be consumed must also be defined by this method (e.g. for preprocessing operators). The default behavior for input consumation is defined by Operator.getInputDescription(Class) and can be changed by overwriting this method. Objects which are not consumed must not be defined as additional output in this method. May be null or an empy array (no additional output is produced).

Specified by:

getOutputClasses in class Operator

getCovarianz

private double getCovarianz(int dim1,
                            int dim2)

getParameterTypes

public java.util.List<ParameterType> getParameterTypes()

Description copied from class: Operator

Returns a list of ParameterTypes describing the parameters of this operator. The default implementation returns an empty list if no input objects can be retained and special parameters for those input objects which can be prevented from being consumed.

Overrides:

getParameterTypes in class Operator